Aptechka

Addon is customized with lua config file
You can place your configuration changes into AptechkaUserConfig/userconfig.lua to avoid overwriting them when updating. Reference config - Aptechka/config.lua.
There's still some basic options available ingame from /apt console command. like positioning.

How to make it hidden when i'm not in a group?
config.showSolo = false

What is UserConfig?
It's a separate addon that contains your personal settings.
Values from UserConfig replace default settings. That way you can safely update core module without losing your changes.
Or you can have 2 UserConfig modules.
It is also possible to add new skins as plugins, and switch between them depending on character class.

Lua knowledge is required?
Probably not, copy-pasting and changing values should be enough for most things.
But editor with Lua syntax highlighting will help you (SublimeText, SciTE, Notepad++). If you want to make your own skin you better be familiar with wow widget api.

What is priority?
When two or more actions assigned to the same spot are active, the one with higher priority is displayed.
Weakened soul is a good example. You won't see WS until PWS is still active.

What is "heal trace"?
That's when you want to know who exactly was healed by your Circle of Healing, Chain Heal, etc in the form of blinking indicator.

How to add new zones and spells for debuff loader?
Instances are identified by map id (assuming they have their own map).
To find out current zone map id type: /dump GetCurrentMapAreaID()
Map IDs are tied to instance name and instance name is tied to function that is pushing boss spells into your current spell set. More info inside userconfig file

What's that combat filtering option for?
Disabled until better days.In 4.2 all autorefreshing spells (SWP-MF, Corruption-Haunt, Lifebloom, Renew-Chakra, etc) stopped generating SPELL_AURA_REFRESH event for combat log. So basically this feature is ruined until Blizzard fix this.
useCombatLogFiltering provides a huge perfomance boost over default behavior, which would be to listen only to UNIT_AURA event.
UNIT_AURA doesn't tell what exactly changed and every time addon had to scan current buffs/debuffs,
In raid combat unit_aura sometimes fired up to 8 times per second for each member with all the stacking trinkets and procs.
useCombatLogFiltering option moves this process mainly to combat log, where we can see what spell was updated.
Only if it's in our spell set it will update buff data for this unit.
The drawback is that it only works in combat log range, but it's big enough, and there's a fallback on throttled unit_aura (every 5s) for out of range units.
On lich king there was an issue, and maybe it's still present, that necrotic plague removal event didn't appear in combat log
and that caused glitches with boss debuff indicator. But that's a rare blizzard side bug.
Dispel idicators still work from unit_aura, so you'll see plague regardless as disease if you can dispel it.

What is Aptechka?
First Aid Kit

How to change skin layout from config?
So to customize frame elements, you'll have to create a custom skin, inherit default skin stuff and then add to/change it. Easy...Default skin source is in frame.lua file

2.2.3:
- new resizing system. you now can resize and switch anchors based on spec/role and raid members count.
By default frames are scaled down for healers after 27 members, and for non healers after 11 members.

2.0.5:
- Bastion of Twilight spells added
- changes to fix taint, width and height for skin now should be preloaded via <SkinName>Settings function. (See upgrading instructions on description tab)
- bugfix for vehicles, probably not the last one

2.0 RC5:
- New group anchors, unique for every skin. group growth options removed. /inj unlockall command, config.useAnchors options to use anchors from another skin
- Stupid getfrom field was removed, and replaced with almost just as stupid alternatives. But anyway, previous version was horrible. = Now you can customize health format
- disableManaBar option restored
- GridSkin_CreateTextTimer function
- Horizontal child skin.

Any chance you can add profile support at some point? Depending on the situation I'd like to have a different set up of the frames. PvP vs Raid vs 5 Man Dungeon.

3)I don't think there will be profiles, tho i added "/inj setpos" command and Injector.anchor:SetPos(point,x,y) function. Tt probably won't help, but you can macro it. also now you can add class spells in load on demand section for arena/raids

UPDATING TO 0.8
1)arena/raid spells should be removed from config
2)A,DT,Trace functions now should be imported, remove them from config file

It seems the indicators are having a slight problem with multiple druids in the raid. Sometimes when my Rejuvenation expires and another druid has one up, the indicator will show the indicator as if it had 0 seconds left on the timer. Here's an example screenshot. Lines are pointing to an expired Rejuvenation and a somewhat fresh one. My target has the other druid's Rejuvenation.

alright, thanks for bug report, that bug was there for ages as it turned out.

It seems the indicators are having a slight problem with multiple druids in the raid. Sometimes when my Rejuvenation expires and another druid has one up, the indicator will show the indicator as if it had 0 seconds left on the timer. Here's an example screenshot. Lines are pointing to an expired Rejuvenation and a somewhat fresh one. My target has the other druid's Rejuvenation.

Another random thing: can vehicle frames replace player frames when they get into one? I'm used to Grid doing it and it was pretty convenient.

I decided I wasn't going to be lazy the other day and actually configured everything to my needs. The only thing I'm looking for other than a text indicator (which you already said you'll get around to sometime) is enabling the tooltip while in combat.

edit: I think I changed it properly. I commented out line 670 in Injector.lua

Is there a way to set up healtraces for HoTs? I have a lightwell tick set up and it doesn't seem to be applying it, didn't know if it was possible or if I simply had injected the code incorrectly. Here is what I have for what it's worth.

I only regesterd here to thank author of this addon! Got here from EJ topic on druids. It is absolutely amazing. I was able to finetune injector to all of my likings over one night, and it was my first time with .lua. Thank you very much for your job. I bet your wow skills are insane too.
PS i still couldn't make em show raid debuffs as icons, but that's probably just me dumb or i should remove color settings in the debuff parameters? ) Also is there a way to show timers and stacks on raid debuffs? And could I implement OmniCC to center icon? That would be the last thing for all of my healing needs ever)
PSS Еще раз спасибо большое!